package com.ks.common.util;

import com.ks.common.model.LoginUser;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import lombok.extern.slf4j.Slf4j;

import java.util.Date;

/**
 * @author KingAusten
 * 2022/08/09 10:54:18
 * jwtutil
 * @version 1.0.0
 */
@Slf4j
public class JWTUtil{


    /**
     * 主题
     */
    private static final String SUBJECT = "base";

    /**
     * 加密密钥
     */
    private static final String SECRET = "base.net168";

    /**
     * 令牌前缀
     */
    private static final String TOKEN_PREFIX = "base-project";


    /**
     * token过期时间，7天
     */
    private static final long EXPIRED = 1000 * 60 * 60 * 24 * 7;


    /**
     * 生成token
     *
     * @param loginUser
     *
     * @return
     */
    public static String geneJsonWebToken(LoginUser loginUser){

        if(loginUser == null){
            throw new NullPointerException("对象为空");
        }

        String token = Jwts.builder()
                .setSubject(SUBJECT)
                //配置payload
                .claim("head_img",loginUser.getHeadImg())
                .claim("account_no",loginUser.getAccountNo())
                .claim("username",loginUser.getUsername())
                .claim("mail",loginUser.getMail())
                .claim("phone",loginUser.getPhone())
                .claim("auth",loginUser.getAuth())
                .setIssuedAt(new Date())
                .setExpiration(new Date(CommonUtil.getCurrentTimestamp() + EXPIRED))
                .signWith(SignatureAlgorithm.HS256,SECRET)
                .compact();

        token = TOKEN_PREFIX + token;
        return token;
    }


    /**
     * 解密jwt
     *
     * @param token
     *
     * @return
     */
    public static Claims checkJWT(String token){

        try{
            final Claims claims = Jwts.parser()
                    .setSigningKey(SECRET)
                    .parseClaimsJws(token.replace(TOKEN_PREFIX,""))
                    .getBody();
            return claims;
        }
        catch(Exception e){

            log.error("jwt 解密失败");
            return null;
        }

    }


}
